Interleaved Heat-Absorbing Discs for Laser Gain Medium Cooling
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Solution Overview
Problem
High intensity pump lasers face thermal aberrations and heating issues due to high absorbed energy densities, which negatively impact beam quality and overall performance, and existing cooling methods have not provided a satisfactory solution.
Innovation Solution
A laser system with a resonator and gain medium segments in the form of cylindrical discs, where heat-absorbing discs are interleafed among the gain medium segments to provide face cooling, utilizing highly thermal conductive materials like copper for effective heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high intensity pump sources are used to deliver high absorbed intensities, then laser output power is improved, but thermal aberrations and heating levels increase
Solution Approach 1:
The gain medium is divided into multiple discrete segments arranged in a stack, with heat-absorbing discs positioned between segments. This segmentation allows heat to be extracted at multiple locations along the gain medium length, preventing heat accumulation and reducing thermal aberrations while maintaining high output power capability.
Solution Approach 2:
Heat-absorbing discs are introduced as intermediary elements between pump sources and gain medium segments. These discs absorb excess heat from the gain medium segments and transfer it to cooling structures, acting as a thermal mediator that protects the gain medium from excessive heating while allowing high intensity pumping to continue.
2Productivity
If high absorbed energy densities are used to operate at near quasi-3 levels, then laser efficiency is improved, but beam quality deteriorates due to thermal aberrations
Solution Approach 1:
By segmenting the gain medium and inserting heat-absorbing discs between segments, the patent enables efficient heat extraction at multiple points. This maintains the high absorbed energy density needed for near quasi-3 level operation while preventing thermal aberrations that would otherwise degrade beam quality.
Solution Approach 2:
The heat-absorbing discs are strategically positioned at specific locations between gain medium segments where heat accumulation occurs. This local heat extraction approach maintains high efficiency operation in the gain medium while locally addressing thermal aberration problems to preserve beam quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The interleafed heat-absorbing discs effectively dissipate heat from the gain medium segments, improving beam quality and reducing thermal aberrations, thus enhancing the performance of high intensity pump lasers.
Implementation Method 1
heat-absorbing discs are interleavely disposed among the gain medium segments to provide face cooling for the gain medium segments
Data Source
AI summary
A laser system having a cooling apparatus is disclosed. The laser system includes a resonator, a gain medium and multiple heat-absorbing discs. The resonator is formed by a first mirror and a second mirror. The gain medium, which is contained within the resonator, is collectively formed by a group of gain medium segments. Each of the gain medium segments is preferably in the shape of a cylindrical disc. The heat-absorbing discs are interleavely disposed among the gain medium segments to provide face cooling for the gain medium segments during the operation of the laser system.